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AI 143472: Reduce dictionary size.

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Changed the tree structure to have variable length nodes to save an average of 21% on the dictionary size.
  Created a shortened English dictionary for Dream - 50K words.
  Added a shortened Spanish dictionary for Dream - 32K words.
  BUG=1743626

Automated import of CL 143472
This commit is contained in:
Amith Yamasani 2009-03-30 07:28:43 -07:00 committed by The Android Open Source Project
parent 772b83b036
commit 8503b063d4
2 changed files with 29 additions and 13 deletions
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19
dictionary/src/dictionary.cpp
View File

@ -85,10 +85,14 @@ int
Dictionary::getAddress(int *pos)
{
int address = 0;
address += (mDict[*pos] & 0x7F) << 16;
address += (mDict[*pos + 1] & 0xFF) << 8;
address += (mDict[*pos + 2] & 0xFF);
*pos += 3;
if ((mDict[*pos] & FLAG_ADDRESS_MASK) == 0) {
*pos += 1;
} else {
address += (mDict[*pos] & (ADDRESS_MASK >> 16)) << 16;
address += (mDict[*pos + 1] & 0xFF) << 8;
address += (mDict[*pos + 2] & 0xFF);
*pos += 3;
}
return address;
}
@ -193,7 +197,8 @@ Dictionary::getWordsRec(int pos, int depth, int maxDepth, bool completion, int s
unsigned short lowerC = toLowerCase(c, depth);
bool terminal = getTerminal(&pos);
int childrenAddress = getAddress(&pos);
int freq = getFreq(&pos);
int freq = 1;
if (terminal) freq = getFreq(&pos);
// If we are only doing completions, no need to look at the typed characters.
if (completion) {
mWord[depth] = c;
@ -266,7 +271,9 @@ Dictionary::isValidWordRec(int pos, unsigned short *word, int offset, int length
}
}
}
getFreq(&pos);
if (terminal) {
getFreq(&pos);
}
// There could be two instances of each alphabet - upper and lower case. So continue
// looking ...
}

23
dictionary/src/dictionary.h
View File

@ -19,35 +19,44 @@
namespace latinime {
// 22-bit address = ~4MB dictionary size limit, which on average would be about 200k-300k words
#define ADDRESS_MASK 0x3FFFFF
// The bit that decides if an address follows in the next 22 bits
#define FLAG_ADDRESS_MASK 0x40
// The bit that decides if this is a terminal node for a word. The node could still have children,
// if the word has other endings.
#define FLAG_TERMINAL_MASK 0x80
class Dictionary {
public:
Dictionary(void *dict, int typedLetterMultipler, int fullWordMultiplier);
int getSuggestions(int *codes, int codesSize, unsigned short *outWords, int *frequencies,
int getSuggestions(int *codes, int codesSize, unsigned short *outWords, int *frequencies,
int maxWordLength, int maxWords, int maxAlternatives);
bool isValidWord(unsigned short *word, int length);
void setAsset(void *asset) { mAsset = asset; }
void *getAsset() { return mAsset; }
~Dictionary();
private:
int getAddress(int *pos);
bool getTerminal(int *pos) { return (mDict[*pos] & 0x80) > 0; }
bool getTerminal(int *pos) { return (mDict[*pos] & FLAG_TERMINAL_MASK) > 0; }
int getFreq(int *pos) { return mDict[(*pos)++] & 0xFF; }
int getCount(int *pos) { return mDict[(*pos)++] & 0xFF; }
unsigned short getChar(int *pos);
int wideStrLen(unsigned short *str);
bool sameAsTyped(unsigned short *word, int length);
bool addWord(unsigned short *word, int length, int frequency);
unsigned short toLowerCase(unsigned short c, int depth);
void getWordsRec(int pos, int depth, int maxDepth, bool completion, int frequency,
void getWordsRec(int pos, int depth, int maxDepth, bool completion, int frequency,
int inputIndex);
bool isValidWordRec(int pos, unsigned short *word, int offset, int length);
unsigned char *mDict;
void *mAsset;
int *mFrequencies;
int mMaxWords;
int mMaxWordLength;
@ -57,7 +66,7 @@ private:
int mInputLength;
int mMaxAlternatives;
unsigned short mWord[128];
int mFullWordMultiplier;
int mTypedLetterMultiplier;
};